Evaporation cooling for horizontal piston motor



April .17, 1951 H. Llsr ET Al.

EVAPORATION COOLING FOR HORIZONTAL PISTON MOTOR Filed March 26, 1949 INVENTORS:

ATTOR N EY and Hans List Patented Apr. 17, 1951 u 2,549,615 ,a EvAPoRA'rIoN COOLINGl Foa HoRIzoNT PISTON MOTOR Hans List and Egon Niedermayer, Graz, Austria; said Niedermayer assignor to said List Application March 26, 1949, Serial No. 837,693 In AllstriaApril 7, 1948 The invention relates to an evaporation cooling for horizontal piston motors (reciprocating engines), andV substantially -consists in that the cooling water space and the evaporation surface of the cooling water in the cooling water space lextend, over the entire length of the cylinder and of the crank case and over the entire width of the'crank case, yet do not exceedthe width of Y the crank case at any point. With the known -arrangements the upper wall, i. e., the ceiling of the Water space is, as a rule, located in part at a lower levelso that thevevaporation surface of the cooling water is confined tol a portion of the cooling water space.

The measure taken according to the invention of utilizing the entire length of the cylinder and of the :crank case as well as the entire widthlof thercrank case for the coolingI water space and Ythe evaporation surface now enables lodging'the greatest possible quantity of vcooling water without having to'let the cooling water space project Y over the width of the crank case. Owing to the fact that the evaporation surface of the cooling water extendsfthe full length and width .of the machine, the direct heat transfer from the water to the air is improved, and With improved cooling the water consumption is decreased, since in the levaporation on a large surface lesswater is entrained, while also at high output and overload suiloient cooling is insured due to the large evaporation surface. .Y f n The portion of the cooling water space present above the crank. case is of special importance for the cooling eiect. If the ywheel is arranged adjacent to the cooling water space, this portion of the cooling` water space, which may be provided with cooling ribs, is intensively cooled by the airentrained by the flywheel. vThis further decreases evaporation, diminishes the water loss, and improves the cooling vof the cylinder;

Apart from the advantages relating to the cooling eect, there is obtained through the invention an esthetic, smooth, and compact design of the machine, in which the coolingv Water space ends ilush with the crank case and recessed angles and edges are largely avoided, so that the machine can always be kept clean with little effort.

3 Claims. (Cl. 12S-41.31)

The drawing illustrates an'embodiment of the invention by way of a diagram.

Fig. 1 is a longitudinal section through the cyl- "inder axis of a horizontal one-,cylinder motor,

viary devices of the motor. spacetoo is cooled is of lesser importance, butV whereas Fig. 2 is a section taken on the line II-II of Fig. 1. f'

The cooling water space I extends over the entire length of thecrank case 2, so that not only the cylinder liner 3 of the motor and the parts 4 of the crank case, adjoining the cylinder liner, are .washed and cooled by the water, but also the upper wall (ceiling) 5 of the crank case. By this design a great increase of the water surface has been obtained, additionally the crank case, on the cooled wall 5 of which the lubricating oil is splashed from the moving organs of the motor, is also cooled. These results are attained without the water space having to be advanced laterally beyond the casing. As shown in Fig. 2 the cooling water space I is laterally limited ac- Cording to the contour of the crank case so as to give the motor a compact shape, and a smooth exterior. I n the `embodiment according to the drawing the space 6, of' th'e'crank case 2, is intended for lodging the valve gear and the auxil- The fact that this an increase of the cooling Water surface is ob tained by having thecooling'water spaceextend also above the space 6. The upper wall, i. e., the ceiling of the coolingv Water space is even, so

that the eicient evaporation surface extends y overV the entirefcooling water space, i. e., over 'the Whole length of'both the cylinder and the crank* case, whereby a most excellent cooling effect is warranted compatible with a minimu consumption of cooling water.

the rotation of the flywheel, the motor casing and/orthe wallsof the cooling Water space l are provided with :cooling ribs 8. I-lence, the evaporation coolingis intensied by the surface cooling of the cooling Water tank so that the cooling water consumption is further reduced.

What we claim is:

1. In yan evaporation cooled horizontal piston engine having a horizontal cylinder and crank case, a cooling-water spacesurrounding the cylinder and extending above the crank case for I the entire length and width of the crank case,

lthe cooling Water level.

2,549,615 f. 3 4 n 2.In an evaporation cooled horizontal piston REFERENCES CITED engine according to Claim l e flywheel arranged The following references are of record in the immediately adjacent to one of the vertical Walls me of this patent: of the cooling-Water space.

3. In an evaporation cooled horizontal piston 5 UNITED STATES PATENTS engine accordingto claim 2, external cooling ribs Number Name Date on one of the vertical Walls of the cooling-Water 1,296,124 Schettler Mar. 4, 1919 spa-ce in an area adjacent to the flywheel. 1,546,103 Perez July 14, 1925 HANS LIST. 2,334,457 Underwood NOV. 16, 1943 EGON NlEDERMAYER. 10 y 

